Thanks Jerry, I forgot about that screen. Turns out it was just a bad filter. It runs better than ever with a new filter and fuel coming from a fresh can. No more horrible smoke and rough idle, etc. Now I need to get the system cleaned up so I don't total any more $23 filters.

I think I'll be needing an electric pump - the clear inline filter was slowly emptying as the truck was idling, which seemed to me to indicate that the IP needed some supply help. To be fair, it was drawing fuel from up high (can sitting on top of radiator) and I was still using the old inline filter - they must really have coarse media, the stuff that ruined the main filter hasn't really bothered the inline filter.

Crossbones, I will check on that Carter part - as long as it isn't strictly a pusher pump (like an in-tank) it should work.

Now I need to do some oil filter research: the Wix I bought is not the right one. Seems to me someone else posted about this a while ago...